Proportion of inspiration and perspiration? It's roughly 45% and 42% (5)
I believe the answer is:
ratio
'proportion' is the definition.
(I've seen this in other clues)
'inspiration and perspiration? it's roughly 45% and 42%' is the wordplay.
'RATIO' is hidden in amongst the letters.
But, I'm unsure how this is indicated.
'of' is the link.
Can you help me to learn more?
(Other definitions for ratio that I've seen before include "eg 1:3" , "Correlation" , "five to four, perhaps" , "One to one - maybe" , "Relation between two things, numbers say" .)